2 year old fruit tree

Bought this in a reputable orchard but have lost the label. Planted in our heavy clay soil it has given us a small amount of apples even in the first year, but I was wondering if we should prune it as branches are quite long - it is only about 5ft in height, I don't think it will be a massive tree, but at the moment I have supports for some of the branches as they were quite heavily dangling down. I may go back to the orchard if no-one can help.